Some companies use assessment days when hiring new employees. It is a sort of extended job interview.
On an assessment day, you will typically, together with other applicants, have to do various tasks and tests that can give the employer an idea of how you are as an employee - e.g. how you collaborate with others and handle time pressure.
➡ What happens on assessment days differs a lot, depending on the type of job in question. Here, we will give you an impression of what to expect and what to prepare for.